Inflatable device for portable spa pool

ABSTRACT

An inflatable device which can fit with a portable SPA pool and has the advantages of low costs, a light weight and convenience for carrying and storage, and can serve as a step for a user to conveniently enter and exit the inflatable pool, a desk on the side of the SPA pool for placing personal articles and a stool for a user to rest near the portable SPA pool. An inflatable device for a portable SPA pool, comprising: a top sheet and a bottom sheet spaced apart from each other in a vertical direction; side walls extending between said top sheet and said bottom sheet, upper edges of said side walls being connected to outer edges of said top sheet, respectively, and lower edges of said side walls being connected to outer edges of said bottom sheet, respectively so as to form an inflatable air chamber; and at least one group of tensioning structures, said tensioning structure being disposed in said air chamber and connected to said top sheet, said bottom sheet and said side walls respectively so as to limit the outward bulging of said top sheet, said bottom sheet and said side walls when said air chamber is inflated.

CROSS REFERENCE

This application claims the benefit and priority of Chinese Application No. 201620373547.0, filed Apr. 28, 2016. The entire disclosures of each of the above applications are incorporated herein by reference.

FIELD OF THE INVENTION

The present invention relates to the field of inflatable products, in particular to an inflatable device for a SPA pool.

BACKGROUND

Portable SPA pools with a massage function are very popular at present, and the portable SPA pools generally have functions such as heating, filtering, wave bubble massage or water flow massage. A portable SPA pool usually comprises a pump body and an inflatable pool connected to the pump body, the inflatable pool has a variety of shapes such as circle, square, rectangle, polygon and oval shapes, and materials for manufacturing an inflatable pool are usually materials suitable for shaping by high frequency welding such as PVC plastic sheet and enhanced PVC plastic sheet. When using a portable SPA pool, a user usually needs to additionally set up a step for the user to enter and exit the inflatable pool, a desk for placing articles such as beverage, fruit, a cell phone, a key and a towel, and a stool or a chair for the user to rest near the inflatable pool. In the prior art, the step, the desk, the stool or chair are generally made of metal or rigid plastic, and they have the defects of large volumes, high costs, heavy weights, inconvenience for carrying and storage, and unsatisfactory fitting with the portable SPA pool, thus bringing much inconvenience to a user.

SUMMARY

An object of the present invention is to provide an inflatable device which can fit with a portable SPA pool and has the advantages of low costs, a light weight and convenience for carrying and storage, and can serve as a step for a user to conveniently enter and exit the inflatable pool, a desk on the side of the SPA pool for placing personal articles and a stool for a user to rest near the portable SPA pool.

The above-mentioned technical problems are solved in the present invention by the following technical solution:

an inflatable device for a portable SPA pool, comprising: a top sheet and a bottom sheet, side walls, and at least one group of tensioning structures. Said top sheet and said bottom sheet spaced apart from each other in a vertical direction; said side walls extending between said top sheet and said bottom sheet, upper edges of said side walls are connected to outer edges of said top sheet, respectively, and lower edges of said side walls are connected to outer edges of said bottom sheet, respectively so as to form an inflatable air chamber; said tensioning structures are disposed in said air chamber and connected to said top sheet, said bottom sheet and said side walls respectively so as to limit the outward bulging of said top sheet, said bottom sheet and said side walls, when said air chamber is inflated.

In an embodiment, said side walls comprise at least two first side walls extending in the lengthwise direction and at least two second side walls extending in the widthwise direction, the length of each of said first side walls is greater than the length of each of said second side walls, the at least two first side walls are arranged opposite to each other, and the at least two second side walls are arranged opposite to each other.

In an embodiment, said tensioning structures comprises at least one first tensioning structure, outer edges of at least one of said first tensioning structures are respectively connected to said top sheet, said bottom sheet and said side walls correspondingly.

In an embodiment, said tensioning structures further comprises at least one second tensioning structure, said second tensioning structure is disposed in said air chamber, and two opposite edges of at least said second tensioning structure are respectively connected to said first side wall and said second side wall.

In an embodiment, said tensioning structures further comprises at least one third tensioning structure, said third tensioning structure is disposed in said air chamber, and two opposite edges of at least said third tensioning structure are respectively connected to said first top sheet and said bottom sheet.

In an embodiment, openings are formed in said first tensioning structure for circulation of air via said openings.

In an embodiment, said first tensioning structures are at least partially disposed in said air chamber in a radial shape.

In an embodiment, said first tensioning structures are at least partially disposed parallel to each other in said air chamber.

In an embodiment, said tensioning structures comprises at least one third tensioning structure and at least one fourth tensioning structure, and at least two edges of said third tensioning structures are connected to said first top sheet and said bottom sheet, respectively; and at least two opposite edges of said fourth tensioning structure are connected to two opposite first side walls, respectively.

In an embodiment, said third tensioning structures and said fourth tensioning structures are disposed alternately and spaced apart from each other in said air chamber.

In an embodiment, said third tensioning structures and said fourth tensioning structures are at least partially disposed in said air chamber in a radial shape.

In an embodiment, said third tensioning structures and said fourth tensioning structures are at least partially disposed parallel to each other in said air chamber.

In an embodiment, said inflatable device further comprises at least one second tensioning structure, said second tensioning structure is disposed in said air chamber, and two opposite edges of said second tensioning structure are respectively connected to said first side wall and said second side wall correspondingly.

In an embodiment, said tensioning structures comprises at least one fifth tensioning structure and at least one sixth tensioning structure, and said fifth tensioning structure is disposed in the lengthwise direction of at least one of said first side walls and is connected to adjacent said first side wall and said bottom sheet, respectively; and said sixth tensioning structure is disposed in the lengthwise direction of at least one of said first side walls and is connected to an adjacent one of said first side walls and said top sheet, respectively.

In an embodiment, said tensioning structures further comprises at least one second tensioning structure, said second tensioning structure is disposed in said air chamber, and two opposite edges of at least said second tensioning structure are respectively connected to said first side wall and said second side wall correspondingly.

In an embodiment, said top sheet and said bottom sheet have one of the following shapes: an arc shape, a right angle C shape, an L shape or a rectangular shape.

In an embodiment, the area of said bottom sheet is greater than that area of said top sheet.

In an embodiment, the included angle between at least one of said first side walls and said top sheet is greater than 90 degrees and less than 225 degrees, and the included angle between said first side wall and said bottom sheet is greater than 45 degrees and less than 90 degrees.

In an embodiment, at least one of said first side walls is perpendicular to said top sheet and said bottom sheet.

In an embodiment, said top sheet, said bottom sheet and said tensioning structures are made of thermoplastic plastic sheet.

In an embodiment, at least one of said top sheet, said bottom sheet and said tensioning structures is made of sandwiched mesh plastic sheet, and said sandwiched mesh plastic sheet comprises two layers of plastic sheet and mesh fabric sandwiched between said two layers of plastic sheet.

In an embodiment, one or more said tensioning structures at least partially comprise mesh fabric or a plurality of threads.

In an embodiment, at least a part of two side surfaces of said mesh fabric or said threads are respectively connected integrally to two opposite sheets of said plastic sheet, and said mesh fabric and said threads are sandwiched between the two opposite sheets of said plastic sheet.

In an embodiment, at least a part of two side surfaces of said mesh fabric or said threads are connected integrally to said plastic sheet which has a U shape, and said mesh fabric and said threads are sandwiched between said plastic sheet.

In an embodiment, said inflatable device is further provided with a connector for connecting two of said inflatable devices to each other or connecting said inflatable device and another article to each other.

The positive progressive effects of the present invention lie in:

a group of tensioning structures is disposed in an air chamber, and said tensioning structures are connected to the top sheet, the bottom sheet and the side walls of the inflatable device so as to limit the outward bulging of said top sheet, said bottom sheet and said side walls when the inflatable device is inflated, such that the inflatable device keeps a good appearance. In addition, the bottom sheet is larger than the top sheet and the inclined side walls, such that the inflatable device has good stability. The inflatable device of the present invention has the advantages of a low manufacturing cost, a light weight, a small volume after deflation, being convenient to use, carry and store, etc.

BRIEF DESCRIPTION OF THE DRAWINGS

The above-mentioned and other features, characteristics and advantages of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, and in the accompanying drawings, like reference numbers indicate like features, in which:

FIG. 1 is a perspective view of an inflatable device for a SPA pool of a first embodiment of the present invention.

FIG. 2 is a partial sectional view of the inflatable device for a SPA pool of the first embodiment of the present invention.

FIG. 3 is an exploded structural schematic view of the inflatable device for a SPA pool of the first embodiment of the present invention.

FIG. 4 is a top view of one group of tensioning structures disposed in an inflatable device for a SPA pool of the first embodiment of the present invention.

FIG. 5 is a top view of the inflatable device for a SPA pool of the first embodiment of the present invention.

FIG. 6 is a front view of a first tensioning structure of the inflatable device for a SPA pool of the first embodiment of the present invention.

FIG. 7 is a front view of a second tensioning structure of the inflatable device for a SPA pool of the first embodiment of the present invention.

FIG. 8 is a front view of a third tensioning structure of the inflatable device for a SPA pool of the first embodiment of the present invention.

FIG. 9 is a perspective view of an inflatable device for a SPA pool of a second embodiment of the present invention.

FIG. 10 is a partial sectional view of the inflatable device for a SPA pool of the second embodiment of the present invention.

FIG. 11 is an exploded structural schematic view of the inflatable device for a SPA pool of the second embodiment of the present invention.

FIG. 12 is a top view of a tensioning structure disposed in the inflatable device for a SPA pool of the second embodiment of the present invention.

FIG. 13 is a top view of the inflatable device for a SPA pool of the second embodiment of the present invention.

FIG. 14 is a front view of a second tensioning structure of the inflatable device for a SPA pool of the second embodiment of the present invention.

FIG. 15 is a front view of a third tensioning structure of the inflatable device for a SPA pool of the second embodiment of the present invention.

FIG. 16 is a front view of a fourth tensioning structure of the inflatable device for a SPA pool of the second embodiment of the present invention.

FIG. 17 is a perspective view of an inflatable device for a SPA pool of a third embodiment of the present invention.

FIG. 18 is a sectional view taken along line A-A in FIG. 17.

FIG. 19 is an exploded view of the inflatable device for a SPA pool of the third embodiment of the present invention.

FIG. 20 is a partial sectional view of the inflatable device for a SPA pool of the third embodiment of the present invention.

FIG. 21 is a perspective view of the application of the inflatable device for a SPA pool of the first embodiment of the present invention.

FIG. 22 is a perspective view of a linear inflatable device for a SPA pool of an embodiment of the present invention.

FIG. 23 is a perspective view of a C-shaped inflatable device for a SPA pool of an embodiment of the present invention.

FIG. 24 is a perspective view of an L-shaped inflatable device for a SPA pool of the third embodiment of the present invention.

DETAILED DESCRIPTION

To make the above-mentioned object, features and advantages of the present invention apparent and easily understood, a detailed description of particular embodiments of the present invention is made in conjunction with the drawings.

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference now will be made in detail to preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The same reference numerals in all the figures denote the same or similar parts wherever possible. Furthermore, although the terms used in the present invention are selected from well-known common terms, some of the terms mentioned in the description of the present invention may be selected by the applicant according to his or her judgement, and the detailed meaning thereof is described in the relevant section described herein. Furthermore, the present invention must be understood, not simply by the actual terms used but also by the meanings encompassed by each term.

FIGS. 1-8 show a first embodiment of the present invention. As shown in FIGS. 1, 2 and 3, an inflatable device for a SPA pool comprises a top sheet 1, a bottom sheet 3, side walls 2 and at least one group of tensioning structures 5. The top sheet 1 and the bottom sheet 3 spaced apart from each other in a vertical direction. The side walls 2 are respectively disposed between the top sheet 1 and the bottom sheet 3, upper edges 201 of the side walls 2 are connected to outer edges 100 of the top sheet 1, respectively, and lower edges 200 of the side walls 2 are connected to outer edges 300 of the bottom sheet 3, respectively so as to form an inflatable air chamber 4. The tensioning structure 5 is disposed in the air chamber 4 and connected to the top sheet 1, the bottom sheet 3 and the side walls 2 respectively so as to limit the outward bulging of the top sheet 1, the bottom sheet 3 and the side walls 2, when the air chamber 4 is inflated.

As shown in FIG. 3, the side walls 2 comprise at least two first side walls 21, 22 extending in the lengthwise direction and at least two second side walls 23, 24 extending in the widthwise direction, the length of the first side walls 21, 22 is greater than the length of the second side walls 23, 24, two first side walls 21, 22 are arranged opposite to each other, and two second side walls 23, 24 are arranged opposite to each other.

As shown in FIGS. 2, 3, 4 and 6-8, the tensioning structures 5 comprises a plurality of first tensioning structures 51, outer edges 511 of the first tensioning structure 51 are respectively connected to the corresponding top sheet 1, the bottom sheet 3 and the side walls 2. In an embodiment with a shorter length, the tensioning structure 5 may comprise at least one first tensioning structure 51.

The tensioning structures 5 further comprises at least one second tensioning structure 52, the second tensioning structure 52 is disposed in the air chamber 4, two opposite edges 521, 522 of the second tensioning structure 52 are respectively connected to two first side walls 21, 22 and one second side wall 24, and at the other end of the inflatable device, two opposite edges 521, 522 of the second tensioning structure 52 are respectively connected to two first side walls 21, 22 and one second side wall 23.

The tensioning structures 5 further comprises at least one third tensioning structure 53, the third tensioning structure 53 is disposed in the air chamber 4, and two opposite edges 531, 532 of the at least one third tensioning structure 53 are respectively connected to the top sheet 1 and the bottom sheet 3.

As shown in FIG. 6, openings 510 are formed in the first tensioning structure 51 at four corners for the circulation of air via the openings 510. As shown in FIG. 7, the second tensioning structure 52 is provided with openings 520 at upper and lower sides respectively for the circulation of air via the openings 520. As shown in FIG. 8, the third tensioning structure 53 is provided with openings 530 at left and right sides respectively for the circulation of air via the openings 530.

As shown in FIGS. 2 and 4, the first tensioning structures 51 are at least partially disposed in the air chamber 4 in a radial shape. The whole inflatable device is of an arc shape.

In the embodiment that the inflatable device as shown in FIGS. 22, 23 and 24 is of a linear shape, a C shape and an L shape, the first tensioning structures can be at least partially disposed parallel to each other in the air chamber 4.

FIGS. 9-16 show a second embodiment of the present invention. As shown in FIGS. 9, 10 and 11, an inflatable device for a SPA pool comprises a top sheet 1, a bottom sheet 3, side walls 2 and at least one group of tensioning structures 5. The top sheet 1 and the bottom sheet 3 are disposed vertically at an interval. The side walls 2 are respectively disposed between the top sheet 1 and the bottom sheet 3, upper edges 201 of the side walls 2 are connected to outer edges 100 of the top sheet 1, and lower edges 200 of the side walls 2 are connected to outer edges 300 of the bottom sheet 3 so as to form an inflatable air chamber 4. The tensioning structures 5 is disposed in the air chamber 4 and is connected to the top sheet 1, the bottom sheet 3 and the side walls 2 so as to limit the outward bulging of the top sheet 1, the bottom sheet 3 and the side walls 2 when the air chamber 4 is inflated.

As shown in FIG. 11, the side walls 2 comprise at least two first side walls 21, 22 extending in the lengthwise direction and at least two second side walls 23, 24 extending in the widthwise direction, the length of the first side walls 21, 22 is greater than the length of the second side walls 23, 24, two first side walls 21, 22 are arranged opposite to each other, and two second side walls 23, 24 are arranged opposite to each other.

As shown in FIGS. 10, 11, 12 and 14-16, the tensioning structures 5 comprises a plurality of third tensioning structures 53, and two outer edges 531, 532 of the third tensioning structure 53 are respectively connected to the corresponding top sheet 1 and the bottom sheet 3. In an embodiment with shorter length, the tensioning structures 5 can comprise at least one third tensioning structure 53.

The tensioning structures 5 further comprises at least one fourth tensioning structure 54, the fourth tensioning structure 54 is disposed in the air chamber 4, and two opposite edges 541, 542 of the fourth tensioning structure 54 are connected to two opposite first side walls 21, 22.

The third tensioning structure 53 and the fourth tensioning structure 54 are disposed alternately and spaced apart from each other in the air chamber 4.

The tensioning structures 5 further comprises a second tensioning structure 52, two opposite edges 521, 522 of the second tensioning structure 52 are respectively connected to two first side walls 21, 22 and one second side wall 24, and at the other end of the inflatable device, two opposite edges 521, 522 of the second tensioning structure 52 are respectively connected to two first side walls 21, 22 and one second side wall 23.

As shown in FIGS. 14 and 15, the second tensioning structure 52 is provided with openings 520 at upper and lower sides respectively for the circulation of air via the openings 520. The third tensioning structure 53 is provided with openings 530 at left and right sides respectively for the circulation of air via the openings 530. The fourth tensioning structure 54 is provided with openings 540 at upper and lower sides respectively for the circulation of air via the openings 540.

As shown in FIGS. 9 and 12, the third tensioning structure 53 and the fourth tensioning structure 54 are at least partially disposed in the air chamber 4 in a radial shape. The whole inflatable device is of an arc shape.

In the embodiment that the inflatable device as shown in FIGS. 22, 23 and 24 is of a linear shape, a C shape and an L shape, the third tensioning structure 53 and the fourth tensioning structure 54 are at least partially disposed parallel to each other in the air chamber.

FIGS. 17 and 18 show a third embodiment of the present invention, and an inflatable device for a SPA pool comprises a top sheet 1, a bottom sheet 3, side walls 2 and at least one group of tensioning structures 5. The top sheet 1 and the bottom sheet 3 are disposed vertically at an interval. The side walls 2 are respectively disposed between the top sheet 1 and the bottom sheet 3. Essentially identical to the foregoing embodiments, the side walls 2 are connected to the top sheet 1, and the side walls 2 are connected to the bottom sheet 3 so as to form an inflatable air chamber 4. The tensioning structures 5 is disposed in the air chamber 4 and is connected to the top sheet 1, the bottom sheet 3 and the side walls 2 so as to limit the outward bulging of the top sheet 1, the bottom sheet 3 and the side walls 2 when the air chamber 4 is inflated.

As shown in FIG. 19, the side walls 2 comprise at least two first side walls 21, 22 extending in the lengthwise direction and at least two second side walls 23, 24 extending in the widthwise direction, the length of the first side walls 21, 22 is greater than the length of the second side walls 23, 24, the first side walls 21, 22 are arranged opposite to each other, and the second side walls 23, 24 are arranged opposite to each other.

The tensioning structures 5 comprises at least one second tensioning structure 52, the second tensioning structure 52 is disposed in the air chamber 4, and two opposite edges 521, 522 of the second tensioning structure 52 are respectively connected to the corresponding first side wall 21 or 22 and the second side wall 23 or 24.

The tensioning structures 5 further comprises at least one fifth tensioning structure 55, and the fifth tensioning structure 55 is disposed in the lengthwise direction of at least one first side wall 21 or 22 and is connected to adjacent first side wall 21 or 22 and the bottom sheet 3.

The tensioning structures 5 further comprises at least one sixth tensioning structure 56, and the sixth tensioning structure 56 is disposed in the lengthwise direction of at least one first side wall 21 or 22 and is connected to an adjacent first side wall 21 or 22 and the top sheet 1.

In conjunction with FIGS. 1-22 at the same time, in an embodiment of the present invention, the top sheet 1 and the bottom sheet 3 can have one of the following shapes: an arc shape (as shown in FIG. 1), a right angle C shape (as shown in FIG. 23), an L shape (as shown in FIG. 24) or a rectangular shape (as shown in FIG. 22).

As shown in FIG. 22, in an embodiment of the present invention, the area of the bottom sheet 3 can be greater than that of the top sheet 1. The included angle θ1 between the first side wall 21 and the top sheet 1 is greater than 90 degrees and less than 225 degrees, and the included angle θ2 between the first side wall 21 or 22 and the bottom sheet 3 is greater than 45 degrees and less than 90 degrees. The other first side wall 22 is perpendicular to the top sheet 1 and the bottom sheet 3. According to the above-mentioned structure, the lower part of the inflatable device is larger than the upper part, thereby imposing relatively good stability.

In the foregoing embodiment, the top sheet 1, the bottom sheet 3 and the tensioning structures 5 are made of thermoplastic plastic sheet.

In the foregoing embodiment, at least one of the top sheet 1, the bottom sheet 3 and the tensioning structures 5 is made of sandwiched mesh plastic sheet, and the sandwiched mesh plastic sheet comprises two layers of plastic sheet and mesh fabric sandwiched between the two layers of plastic sheet.

In the foregoing embodiment, one or more tensioning structures 5 at least partially comprise mesh fabric or a plurality of threads. At least a part of two side surfaces of the mesh fabric or the threads are respectively connected integrally to two opposite sheets of plastic sheet, and the mesh fabric and the threads are sandwiched between the two opposite sheets of plastic sheet. At least a part of two side surfaces of the mesh fabric or the threads are connected integrally to the U-shaped plastic sheet, and the mesh fabric and the threads are sandwiched between the plastic sheet.

As shown in FIG. 21, inflatable devices 7, 8 and 9 are disposed around a SPA pool and are close to the wall of the SPA pool; it can be understood that connectors can be further disposed between the inflatable devices 7, 8 and 9 to connect two or more inflatable devices 7, 8 and 9 to each other, or the inflatable devices 7, 8 and 9 are connected to connectors disposed on the SPA pool. The connectors can be an inserting buckle, a hook-and-loop fastener, a connecting band, a connecting rope, a hook, etc. The inflatable devices 7 and 9 with a large height can be used as side tables of the SPA pool, and the inflatable device 8 with a small height can serve as a step for a user to conveniently enter and exit the SPA pool, or serve as a stool for a user to rest outside the SPA pool.

While the particular embodiments of the present invention have been described, a person skilled in the art should understand that these are merely illustrative, and that the scope of protection of the present invention is defined by the appended claims. Various alterations or modifications can be made by a person skilled in the art to these embodiments without departing from the principle and substance of the present invention; however, these alterations and modifications all fall within the scope of protection of the present invention. 

What is claimed is:
 1. An inflatable device for a portable SPA pool, comprising: a top sheet and a bottom sheet spaced apart from each other in a vertical direction; side walls extending between said top sheet and said bottom sheet, upper edges of said side walls being connected to outer edges of said top sheet, respectively, and lower edges of said side walls being connected to outer edges of said bottom sheet, respectively so as to form an inflatable air chamber; and at least one group of tensioning structures, said tensioning structures being disposed in said air chamber and connected to said top sheet, said bottom sheet and said side walls respectively so as to limit the outward bulging of said top sheet, said bottom sheet and said side walls when said air chamber is inflated.
 2. The inflatable device as claimed in claim 1, wherein said side walls comprise at least two first side walls extending in the lengthwise direction and at least two second side walls extending in the widthwise direction, the length of each of said first side walls is greater than the length of each of said second side walls, the at least two first side walls are arranged opposite to each other, and the at least two second side walls are arranged opposite to each other.
 3. The inflatable device as claimed in claim 2, wherein said tensioning structures comprises at least one first tensioning structure, and outer edges of said at least one first tensioning structure are respectively connected to said top sheet, said bottom sheet and said side walls correspondingly.
 4. The inflatable device as claimed in claim 3, wherein said tensioning structures further comprises at least one second tensioning structure, said second tensioning structure is disposed in said air chamber, and at least two opposite edges of said second tensioning structure are respectively connected to said first side wall and said second side wall.
 5. The inflatable device as claimed in claim 3, wherein said tensioning structures further comprises at least one third tensioning structure, said third tensioning structure is disposed in said air chamber, and at least two opposite edges of said third tensioning structure are respectively connected to said top sheet and said bottom sheet.
 6. The inflatable device as claimed in claim 3, wherein openings are formed in said first tensioning structure for circulation of air via said openings.
 7. The inflatable device as claimed in claim 3, wherein said first tensioning structures are at least partially disposed in said air chamber in a radial shape.
 8. The inflatable device as claimed in claim 3, wherein said first tensioning structures are at least partially disposed parallel to each other in said air chamber.
 9. The inflatable device as claimed in claim 2, wherein said tensioning structures comprises at least one third tensioning structure, at least two edges of said third tensioning structure being connected to said top sheet and said bottom sheet, respectively; and at least one fourth tensioning structure, at least two opposite edges of said fourth tensioning structure being connected to two opposite first side walls, respectively.
 10. The inflatable device as claimed in claim 9, wherein said third tensioning structures and said fourth tensioning structures are disposed alternately and spaced apart from each other in said air chamber.
 11. The inflatable device as claimed in claim 9, wherein said third tensioning structures and said fourth tensioning structures are at least partially disposed in said air chamber in a radial shape.
 12. The inflatable device as claimed in claim 9, wherein said third tensioning structures and said fourth tensioning structures are at least partially disposed parallel to each other in said air chamber.
 13. The inflatable device as claimed in claim 9, wherein said inflatable device further comprises at least one second tensioning structure, said second tensioning structure is disposed in said air chamber, and two opposite edges of said second tensioning structure are respectively connected to said first side wall and said second side wall correspondingly.
 14. The inflatable device as claimed in claim 2, wherein said tensioning structures comprises at least one fifth tensioning structure, said fifth tensioning structure being disposed in the lengthwise direction of at least one of said first side wall and being connected to an adjacent one of said first side walls and said bottom sheet, respectively; at least one sixth tensioning structure, said sixth tensioning structure being disposed in the lengthwise direction of at least one of said first side wall and being connected to an adjacent one of said first side walls and said top sheet, respectively.
 15. The inflatable device as claimed in claim 14, wherein said tensioning structures further comprises at least one second tensioning structure, said second tensioning structure is disposed in said air chamber, and two opposite edges of at least said second tensioning structure are respectively connected to said first side wall and said second side wall correspondingly.
 16. The inflatable device as claimed in claim 1, wherein said top sheet and said bottom sheet have one of the following shapes: an arc shape, a right angle C shape, an L shape or a rectangular shape.
 17. The inflatable device as claimed in claim 1, wherein the area of said bottom sheet is greater than the area of said top sheet.
 18. The inflatable device as claimed in claim 2, wherein the included angle between at least one of said first side walls and said top sheet is greater than 90 degrees and less than 225 degrees, and the included angle between said first side wall and said bottom sheet is greater than 45 degrees and less than 90 degrees.
 19. The inflatable device as claimed in claim 17, wherein at least one of said first side walls is perpendicular to said top sheet and said bottom sheet.
 20. The inflatable device as claimed in claim 1, wherein said top sheet, said bottom sheet and said tensioning structures are all made of thermoplastic plastic sheet.
 21. The inflatable device as claimed in claim 1, wherein at least one of said top sheet, said bottom sheet and said tensioning structures is made of sandwiched mesh plastic sheet, and said sandwiched mesh plastic sheet comprises two layers of plastic sheet and mesh fabric sandwiched between said two layers of plastic sheet.
 22. The inflatable device as claimed in claim 21, wherein one or more said tensioning structures at least partially comprise mesh fabric or a plurality of threads.
 23. The inflatable device as claimed in claim 22, wherein at least a part of two side surfaces of said mesh fabric or said threads are respectively connected integrally to two opposite sheets of said plastic sheet, and said mesh fabric and said threads are sandwiched between the two opposite sheets of said plastic sheet.
 24. The inflatable device as claimed in claim 22, wherein at least a part of two side surfaces of said mesh fabric or said threads are connected integrally to said plastic sheet which has a U shape, and said mesh fabric and said threads are sandwiched between said plastic sheet.
 25. The inflatable device as claimed in claim 1, wherein said inflatable device is further provided with a connector for connecting two of said inflatable devices to each other or connecting said inflatable device and another article to each other. 